Tensions are running high between Miley Cyrus and Liam Hemsworth, and now In Touch can exclusively reveal the shocking reason behind the couple's fights.

A wedding might not happen, and it's due to a lack of trust between the two. "Liam is always picking fights with Miley for no reason, which gives her severe anxiety,” a source revealed. “He recently got angry with Miley because whenever he calls or texts, she doesn’t respond quickly enough."

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But Miley thinks Liam is being shady, too. "She thinks Liam has been very flirty with other girls lately," the source continued. "She's accused him of flirting with waitresses, friends, even her older sister, Brandi."

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The 24-year-old has chosen to remain optimistic as their relationship unravels, "She's telling friends that she still wants a wedding and family with Liam," the source said. "Miley really wants this to work, but fears the end is near."

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